Sunderland boss Sam Allardyce has apologised to Jurgen Klopp over his comments about Liverpool's injury crisis.

Allardyce claimed Klopp had underestimated how 'ferocious' the Premier League is, and the spate of hamstring injuries were down to his insistence on a high-tempo pressing game, when he spoke with talkSPORT on Wednesday.

Sam Allardyce and Jurgen Klopp have clashed twice since the German's arrival at Anfield

The Reds lost three more players to injury during their Capital One Cup semi-final first-leg win over Stoke City on Tuesday, and key midfielder Philippe Coutinho appears likely to be sidelined until February with his hamstring issue.